In which of the following can hydrogen bonding occur?
A) in a solution of acetone in water
B) in a solution of formaldehyde in water
C) in a solution of acetone and formaldehyde in water
D) in all of these cases
D
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In what sense do we say we are looking back in time when we are looking at the stars?
A. We see stars as they once were when their light reaches us. B. Because Earth's atmosphere bends and distorts their light. C. Because stars are emitting immense radiation, we are seeing processes that have already happened. D. Because space curves, we are actually looking at the past when we look in the night sky.
A fold in which rocks fold down in the shape of a U is a(n)
A) anticline. B) syncline. C) monocline.
Biomagnification occurs most commonly in which organisms?
A. birds of prey B. predator fish C. carnivores D. All of these statements are correct E. None of these statements are correct
Weathering depths in rocks subjected to similar climates are:
a. relatively constant b. slightly variable c. moderately variable d. highly variable